In order to reduce the internal porosity and improve the quality of aluminum alloy weld seam, the wobbling fiber laser is performed on the 8mm 5083 aluminum alloy locked bottom butt joint in laser-MIG hybrid welding. The influence of the weaving frequency and amplitude of the laser beam on the porosity and the penetration was studied. Orthogonal experiments were carried out to investigate the primary and secondary relations between the influence of laser power, welding speed, welding current and weaving frequency on the formation of weld porosity. The optimal parameters were obtained and the microstructure and mechanical properties of the weld joint under the optimal parameters were analyzed. The result shows that the laser beam swing frequency and amplitude are helpful to eliminate stomatal imperfections. The effect of the factors on the porosity is following by the laser weaving frequency, welding current, welding speed, laser power. To weld 6mm 5083 aluminum alloy by using the parameters, power 6800W, welding current 136A, welding speed 28mm/s, weaving frequency 240Hz, wobble amplitude 1.5mm, we can get joint with no obvious pores, which average hardness is 70.4HV, and the tensile strength of welded joints can reach 278MPa, reaching 91.9% of the base metal.